Hmm.. Well, if not feeling something bothers you, then maybe you should see a Therapist/Counselor for more information? It could just be basic desensitization, but I'm not going to play pretend Psychiatrist and act like I know.

However, I am curious. Do you have any history or mental illness in your family (that you're aware of) and/or do you have any kind of extreme anti-social behaviors? (Example would be: You are walking down a hallway and see someone walking in your direction. You proceed to get very anxious, angry, and/or just try to get away.)